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Moving-magnet type linear d.c. brushless motor having plural moving elements

  • US 5,023,495 A
  • Filed: 04/17/1990
  • Issued: 06/11/1991
  • Est. Priority Date: 04/17/1990
  • Status: Expired due to Fees
First Claim
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1. A moving-magnet type linear d.c. brushless motor having plural moving elements, which comprises:

  • a stator armature provided along a traveling track of moving elements;

    n moving elements, each including a thrust-generating field magnet having an arrangement of P contiguous magnetic poles of alternating N and S polarity, where n is an integer of at least 2 and P is an integer of at least 1, the moving elements being face to face with the stator armature and traveling separately and independently;

    n position-detecting magnets, which are provided respectively on said n moving elements each of the position-detecting magnets having P magnetic poles of N and S polarity at in-phase position relative to the thrust-generating field magnets and substantially the same pitch as that between N and S magnetic poles in each of the thrust-generating field magnets; and

    n groups of position sensors, each group facing a corresponding one of the position-detecting magnets, and detecting signals from the magnetic poles of the corresponding position-detecting magnet, so that in accordance with respective detected signals of positions of the poles of the position-detecting magnets from said respective group of the position sensors, an electric current is caused to flow into the stator armature facing the thrust-generating field magnet of said moving element having said position-detecting magnet so as to generate thrust, which causes said detected moving element to move in a predetermined direction, whereby said moving elements are energized and controlled to travel separately and independently.

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